Series Information

CGPI measures the price developments of goods that are traded within the corporate sector. Purposes of the index including getting a grasp of supply-demand trends in goods, and to provide information of economic indicators showing economic trends on assessing economic developments and monetary policy, through collecting prices of goods traded in the corporate sector.

The Basic grouping indexes, in which commodities are classified based on Japan Standard Industrial Classification or partly the attribute of product, are composed of Producer Price Index (PPI), Export Price Index (EPI), and Import Price Index (IPI).

The Bank of Japan (BOJ) surveys prices of goods produced and traded domestically excluding those goods exported via domestic market in the corporate sector, mainly at the time of shipment by producers. In the 2015 base, the PPI is classified into five major groups and further classified into 23 groups and it is compiled including the consumption tax.

In addition, indexes excluding extra charges for summer electricity, which adjust extra charges applied during summer season from July to September, are compiled as reference. The price levels of these indexes correspond to those of the Basic grouping indexes during the normal charge period from October to June.

Export Price Index (EPI) and Import Price Index (IPI)

The stage and timing of price collection of goods for the EPI and IPI are at the time cargo is loaded/unloaded in Japan at the customs clearance stage, respectively. These indexes are compiled on both a yen basis and a contract currency basis. In the 2015 base, the EPI and IPI are classified into seven groups and 10 groups, respectively and they are compiled using prices without the consumption tax.

The export and import values of 2015 in the Trade Statistics of Japan by Ministry of Finance are used for their weight calculation.